include/asm-arm/ucontext.h

   1 #ifndef _ASMARM_UCONTEXT_H
   2 #define _ASMARM_UCONTEXT_H
   3
   4 #include <asm/fpstate.h>
   5
   6 /*
   7  * struct sigcontext only has room for the basic registers, but struct
   8  * ucontext now has room for all registers which need to be saved and
   9  * restored.  Coprocessor registers are stored in uc_regspace.  Each
  10  * coprocessor's saved state should start with a documented 32-bit magic
  11  * number, followed by a 32-bit word giving the coproccesor's saved size.
  12  * uc_regspace may be expanded if necessary, although this takes some
  13  * coordination with glibc.
  14  */
  15
  16 struct ucontext {
  17         unsigned long     uc_flags;
  18         struct ucontext  *uc_link;
  19         stack_t           uc_stack;
  20         struct sigcontext uc_mcontext;
  21         sigset_t          uc_sigmask;
  22         /* Allow for uc_sigmask growth.  Glibc uses a 1024-bit sigset_t.  */
  23         int               __unused[32 - (sizeof (sigset_t) / sizeof (int))];
  24         /* Last for extensibility.  Eight byte aligned because some
  25            coprocessors require eight byte alignment.  */
  26         unsigned long     uc_regspace[128] __attribute__((__aligned__(8)));
  27 };
  28
  29 #ifdef __KERNEL__
  30
  31 /*
  32  * Coprocessor save state.  The magic values and specific
  33  * coprocessor's layouts are part of the userspace ABI.  Each one of
  34  * these should be a multiple of eight bytes and aligned to eight
  35  * bytes, to prevent unpredictable padding in the signal frame.
  36  */
  37
  38 #ifdef CONFIG_IWMMXT
  39 /* iwmmxt_area is 0x98 bytes long, preceeded by 8 bytes of signature */
  40 #define IWMMXT_MAGIC            0x12ef842a
  41 #define IWMMXT_STORAGE_SIZE     (IWMMXT_SIZE + 8)
  42
  43 struct iwmmxt_sigframe {
  44         unsigned long   magic;
  45         unsigned long   size;
  46         struct iwmmxt_struct storage;
  47 } __attribute__((__aligned__(8)));
  48 #endif /* CONFIG_IWMMXT */
  49
  50 #ifdef CONFIG_VFP
  51 #if __LINUX_ARM_ARCH__ < 6
  52 /* For ARM pre-v6, we use fstmiax and fldmiax.  This adds one extra
  53  * word after the registers, and a word of padding at the end for
  54  * alignment.  */
  55 #define VFP_MAGIC               0x56465001
  56 #define VFP_STORAGE_SIZE        152
  57 #else
  58 #define VFP_MAGIC               0x56465002
  59 #define VFP_STORAGE_SIZE        144
  60 #endif
  61
  62 struct vfp_sigframe
  63 {
  64         unsigned long           magic;
  65         unsigned long           size;
  66         union vfp_state         storage;
  67 };
  68 #endif /* CONFIG_VFP */
  69
  70 /*
  71  * Auxiliary signal frame.  This saves stuff like FP state.
  72  * The layout of this structure is not part of the user ABI,
  73  * because the config options aren't.  uc_regspace is really
  74  * one of these.
  75  */
  76 struct aux_sigframe {
  77 #ifdef CONFIG_IWMMXT
  78         struct iwmmxt_sigframe  iwmmxt;
  79 #endif
  80 #if 0 && defined CONFIG_VFP /* Not yet saved.  */
  81         struct vfp_sigframe     vfp;
  82 #endif
  83         /* Something that isn't a valid magic number for any coprocessor.  */
  84         unsigned long           end_magic;
  85 } __attribute__((__aligned__(8)));
  86
  87 #endif
  88
  89 #endif /* !_ASMARM_UCONTEXT_H */